As an imaging examination method, color Doppler ultrasound can examine the kidneys and detect signs of kidney diseases, including kidney cancer, but it cannot serve as a definitive basis for diagnosing kidney cancer. Color Doppler ultrasound observes the size, shape, structure, and other medical information of the examined organ. From this information, some clues indicating kidney cancer can be found. However, to confirm kidney cancer, a pathological diagnosis is often required. Pathological diagnosis involves performing a kidney biopsy or surgically removing a part of the kidney tissue for pathological examination to definitively determine the presence of kidney cancer. Thus, color Doppler ultrasound can only serve as a clue in the investigation of kidney cancer.